Jörg Ott is Professor for Networking Technology with a focus
on Protocols, Services, and Software in the
Department of Communications and Networking in the School of
Electrical Engineering at Aalto University.
From 1997 through early 2005, he was Assistant
Professor in the Computer Networks group at the Universität
Bremen and member of the Center for Computing Technologies
(TZI). From 1992 through 1997 he worked as a research staff
member with teaching responsibilities at TU Berlin.
He received his Doctor in Engineering (Dr.-Ing.) in 1997 from
Technische Universität Berlin.

His research interests are in network architectures, protocol
design, and networked systems, from modeling to
implementation. His current research focus areas include
communication in challenged networks, particularly
delay-tolerant/mobile opportunistic networking; adaptive
real-time communication, information-centric networking,
and network measurements.
He is co-chair of the DTN Research Group in the IRTF. In the
IETF, was co-chair of the MMUSIC working group from 1997
through 2009 and co-chaired the SIP working group from its
foundation in 1999 to October 2002. Jörg co-founded Tellique
Kommunikationstechnik GmbH (1998), which provided solutions
for IP multicast-based content distribution and performance
enhancements for satellite and other challenged networks;
Lysatiq GmbH (2007), which provided solutions for disconnection
tolerance and performance optimizations for challenged
networks and mobile Internet access; Spacetime Networks Oy
(2013), which provides software solutions for enabling networking
(not just) in challenging industrial environments; and
NeMu ("Networked Multimedia") Dialogue Systems Oy (also: callstats.io),
which provides QoS and QoE monitoring and analysis for
(interactive) (WebRTC-based) multimedia services.

Switching jobs: I will leave my Full Professor position at Aalto University effective
1 August 2015 to take up the BMW-endowed Chair on Connected Mobility at Technische
Universität München. I will remain affiliated with Aalto University as an
Adjunct Professor.

Delay-/Disruption-tolerant Networking.
Diverging from today's usual approaches towards supporting mobile
users by providing ubiquitous and seamless connectivity across
several networks, the goal of this research area is to accept the
non-permanent nature of connectivity experienced and achievable
today. My primary interest is to investigate architectures,
protocols, and applications to maximize the gain a user a draw
even from rare and short-lived connectivity as one aspect and to
minimize the impact of connectivity interruption when commuting or
traveling. One early example is the introduction
of Drive-thru
Internet — an application scenario where we provide
WLAN-based short range connectivity islands to users traveling at
potentially high speeds on the road.

Mobile opportunistic networking and computing.
Leveraging the capabilities of mobile devices for autonomous
communication systems that may benefit from infrastructure (or
cloud) assistance but do not rely on them. My interests range
from (DTN-style) ad-hoc messaging (see above) to content sharing
and programming paradigms to application ecosystems for such
autonomous networks. One main theme is probabilistic content
sharing using Floating
Content and geo-based sharing applications on top. In this
context, we have
designed
the ONE simulator and are investigating mobility models
for humans especially in urban areas.

Network architecture.
I am interested in alternative approaches to network
architectures. We are investigating elements of delay-tolerant
networking as one building block. We are also looking
information-centric networking as clean slate designs but also as
incrementally deployable solutions based upon CDNs and HTTP.
Specific interests include the equivalent of transport protocols
and adaptive media streaming in such architectures.

Internet measurements.
Understanding the content characteristics and user behavior as
input to network and protocol design and evaluation, and network
characteristics for assessing system and protocol performance. We
are investigating the characteristics of web pages, the operation
of adaptive media streaming, the performance of different (wired
and wireless) access technologies, and communication opportunities
via WLAN hot-spots.

I spend quite some time in Internet-related standardization, as a
contributor but also as one way of keeping track of real-world
problems and industry directions.
I have been participating in the
IETF since 1993 focusing on the
areas outlined above, particularly control and transport protocols
for multimedia conferencing. I was co-chair of
the MMUSIC
WG from 1997 through 2009 and of the SIP WG from 1999 through
2002. I am now co-chairing
the Delay-tolerant Networking
Research Group (DTNRG). I am presently particularly interested
in real-time transport (AVT WG, RMCAT WG, and related ones),
web-based multimedia conferencing (RTCweb WG), information-centric
networking (ICNRG), and recently in performance metrics for the
Internet.

In a former life, from 1994 through 2000, I have been active in the
Telecommunication Sector of the International Telecommunication
Union (ITU-T, formerly known as CCITT). Particular interests
included the infrastructure for data conferencing (T.120) which was
developed by Study Groups 8 and later 16 and the design of the H.323
series of Recommendations for IP-based multimedia conferencing (in
local area networks) and IP telephony which I accompanied from the
the very beginning in early 1995, first in SG15 and later in SG16.

RIFE: architectuRe for an Internet For Everybody. A
project funded by the EC Horizon 2020 program to provide
affordable and sustainable access to the Internet by realizing
an architecture for an Internet for everybody that enables
access to information and services at economically sustainable
price points unmatched by today's technologies while also
catering to challenges, such as intermittent connectivity, posed
by the varying environmental challenges that are imposed on
those who want to connect. RIFE will devise a unifying network
architecture, incorporating elements of delay-tolerant and
information-centric networking, develop dissemination strategies
to enable Internet access in diverse settings, and implement
application-specific functions as necessary to support today's
and future services.

SSICLOPS: Scalable and Secure Architecture for Cloud Operations.
A project funded under the EC Horizon 2020
program to create and operate high-performance private cloud
infrastructure that allows flexible scaling through federation
with other private clouds without compromising their service
level and security requirements. SSICLOPS federation will
support the efficient integration of clouds, no matter if they
are geographically co-located or distributed, belong to the
same or different administrative entities or jurisdictions.
We will devise efficient and secure transport protocols for
both intra- and inter-cloud/data center communication and
develop mechanisms for flexible job scheduling and migration
supported by cloud performance monitoring and tuning
functions. We will explore four use cases from in-memory data
bases high-performance computing (high-energy physics) to
cloud bursting to network function virtualization.

CloSe

Jul 2014 –
June 2016

CloSe: Cloud Security Services. A joint academic and
industry project funded by the Academy of Finland and Tekes on
provide secure access to cloud-based services and information
as well as secure storage and service provisioning inside the
cloud. Our focus is on privacy-preserving data access, secure
data storage and deduplication, and scalable network
infrastructure support.

METRICS: Measurement for Europe: Training and Research for Internet Communications Science.
An EC FP7 Marie Curie Initial Training Networking for 13 PhD
students and one post-doctoral researcher on network
measurements in the fixed and mobile Internet and within data
centers. Research is complemented by summer schools on
scientific writing and presentations, tools and methodology,
and entrepreneurship. Aalto Comnet work will focus on 1)
(mobile) network measurements and QoE prediction and 2) data
analysis, trace-based modeling, and simulations of human
behavior.

PRECIOUS: Preventive Care Infrastructure based on Ubiquitous
Sensing: A cross-disciplinany project on behavioral
monitoring through sensors and networked services and offering
feedback to users on how healthy their lifestyle is. The
speicfic target is food intake monitoring and fostering
behavioral changes to counter obesity. The share of Aalto
Comnet is in offering robust communication and data collection
mechanisms using sensors and smart phones.

A large European cooperation framework to foster research,
education, and innovation between seven core nodes (Berlin,
Eindhoven, Helsinki, Paris, Stockholm, Trento) and numerous
associated partners in each country. Sub-projects, Activities,
are granted on an annual basis and are intended to complement
existing research funding towards the above goals, with a strong
emphasis on busiess and innovation. My research group has been
involved in activities on opportunistic networking,
information-centric networking, software-defined networking, and
(web-based) multimedia communication.

Leone: From global measurements to local management: An
EC FP7 project within the Future Internet framework in which we
develop and utilize a global measurement platform that uses
probes to carry out end user-based measurements of network
characteristics and collects those measurements in
(per-provider) database. Defined interfaces will allow ISPs to
share selected information in support troubleshooting and root
cause analysis, assist network management, and offer
visualization of network properties.

PDP: Picking Digital Pockets: A project funded by the
Academy of Finland on exploring regional distributed search
protocols and algorithms in mobile opportunistic networks, made
up exclusively of mobile devices carried by human users. Human
users may make information on their devices available for
sharing with others, including static files (e.g., a published
mobile profile), dynamically created contents (e.g., photos),
dynamically retrieved contents (e.g., cached pages), and
ephemeral sensed data. We will investigate how to mine such
data with minimal overhead and aim at understanding how
congruent searches issued by different devices will be. This
project is carried out in cooperation with Jussi Kangasharju
(University of Helsinki).

IoT: Internet-of-Things is a national Finnish project
funded by Tivit/Tekes, addressing different aspects for
machine-to-machine communication. The projects spans all areas
from lower layer technologies to application trials with strong
industry involvement. Our focus is on congestion control for
IoT environments and on communication in mines.

SCAMPI: Service platform for soCial Aware Mobile and
Pervasive computIng: An EC FP7 project within the Future
Internet framework in which we develop an environment
facilitating opportunistic social networking among mobile
devices without reliance on infrastructure. This specifically
includes the design of a service creation architecture for
mobile opportunistic networks that can deal with changing node
availability and reachability. The project has a strong focus
on system design and implementation which also constitute the
focus area of the Comnet contribution.

PURSUIT: Publish Subscribe Internet Technologies: A
project funded by the Europea Commission under the 7th Framework
Programme that, as a successor of the PSIRP project, addresses
transport, application layer, and operational issues of
information-centric networks based upon the publish-subscribe
paradigms. The focus of Comnet wil be on transport protocols
for pub/sub networks and their implications on application
protocol design.

RESMAN

Jan 2010 –
Dec 2012

RESMAN: Resource Management in Delay-tolerant Mesh and Ad-hoc
Networks: A project funded by the Academy of Finland that
targets addressing the utilization of different (scarce)
resources, especially energy, link capacity, and buffer space,
in Delay-tolerant mobile networks in a coherent fashion for
routing/forwarding and congestion management strategies.

Trilogy: Architecting the Future Internet: An EC FP7
project within the Future Internet framework in which we
specifically explore reachability between nodes via multiple
paths and transport protocols to take advantage of multipath
routing. My specific interest is in multipath transport for
reliable and particularly for real-time communications.

GLASS

Jun 2009 –
Dec 2009

Geo-Location Assisted Streaming Service: A project funded
directly by the industry in which we investigate options for
geo-awareness as input for adaptive rate control mechanisms for
mobile streaming video application.

Finnish Future Internet: A Finland-wide research project
funded jointly by TEKES and industry partners in which a
consortium of academic and industry partners jointly explore
directions for future global internetworks. The overall
research spans all layers from physical infrastructure to
applications. Research combines aspects of evolutionary
innovation within the architecture of the present Internet to
clean-slate design ideas. My research encompasses work on
transport protocols and delay-tolerant communications as well as
on information (content-oriented) networking.

MoViE

Jan 2008 –
Dec 2008

Mobile Video Enhancements: A project funded directly by
the industry that investigates adaptive error and rate control
for mobile video applications (conversational and streaming
media). We also investigate RTP/RTCP for peer-to-peer media
streaming.

CATDTN

Jan 2008 –
Dec 2008

Connectivity, Applications, and Trials of Delay-tolerant
Networking: A project funded directly by the industry in
which we are developing a few trial applications for mobile
users, for which we also set up a small (partly virtual,
partly physical) trial network. We investigate resource
management for mobile devices in conjunction with security
mechanisms.

Challenged Internet Access Network Technology
Infrastructure: An EC FP7 project on supporting personal and
vehicular mobility as well as nomadic computing incrementally in
today's Internet. The base assumption is that mobility and
nomadicity will lead to challenged networking conditions due to
(unforeseeable) disconnections. The project develops technical
solutions to support robust communications in such challenged
networks with and without infrastructure assistance.

Multicast IPTV

Jan 2008 –
Dec 2008

Adaptive Error Measurement, Concealment, and Repair for IP
Streaming Video: A joint project with University of Glasgow
(Colin Perkins) funded by Cisco Research on multicast-based IPTV
media distribution and repair. The project addresses repair by
intermediaries and peers and investigates diagnosing network
characteristics from observing reception statistics across
different receivers from individual and multiple media streams,
for which suitable quality metrics will be derived.

REDI

2007 – 2009

Rethinking the Design of Internet Application Protocols for a
Mobile Future: A project funded by a grant from
Teknologiateollisuus ry on adapting and enhancing application
protocol design to (a) support delay-/disconnection-tolerant
operation to increase robustness and better support mobility and
(b) to make application protocols aware of underlying networking
characteristics so that they can take sensible decisions about
their mode of operation and communication.

DISTANCE

Jan 2007 – Dec 2009

A project funded by the Academy of Finland on generic support
for application-specific functions in intermediate nodes in
Delay-tolerant Networking (DTN) environments. Concrete examples
include the distributed storage and retrieval of contents using
hints from the application as well as opportunistic support for
application-specific routing and forwarding policies.

SINDTN

Jan 2007 – Dec 2007

Security Infrastructure for DTN: A project
directly funded from industry on security for DTN applications
and DTN-based forwarding in ad-hoc networks and their
realization for the DTNRG protocol specifications. The project
also investigates leveraging Identity-based Cryptography (IBC)
and the 3G infrastructure for mobile user authentication.

A project directly funded from industry on exploring end-user
security functionality in Delay-tolerant Networking environments
by building a small demonstrator for mobile devices.

IVIHUT

Mar 2006 – Dec 2006

A project directly funded from industry that deals with Interactive
VIdeo applications and researches error-resilient packet
video communications with a particular focus on mixed
wired-wireless environments, aspect of the implementation and
system integration of video codecs, and multiparty multimedia
communications.

Exploiting short-lived Internet connectivity for mobile users on
the road by means of connectivity islands provided by 802.11
wireless LANs as inexpensive yet powerful communications
infrastructure. The research project has shown that vehicles
traveling at speed of 180km/h and more can be supported with
off-the-shelf equipment today — provided that
appropriate Drive-thru Services are available to the
mobile users that conceal the intermittent nature of
connectivity from the user's general purpose applications.
Ongoing research in this self-funded project investigates the
use of more general concepts of Delay-tolerant Networking
(DTN) to mobile ad-hoc communications.

These projects are students projects carried out at the Aalto Design Factory
by international students from different disciplines, with about 8–12 students
per project.
See the Product Development Project web site for an
overview.

Low-cost DIY
Networking

Sep 2014 –
May 2015

Providing a hardware and minimal software design to provide
robust, rugged, and autonomously operating liberouter (see
below) system. The design focuses on energy harvesting and
energy management with suitable enclosures for different
environments (floating in water, put up in a tree or on a mast)
from inexpensive off-the-sehlf components. The system will run
the liberouter platform and offer applications for the target
environment on top.

Designing devices for censorship-resistant communication using
local range wireless communication. We are building autonomous routers
using the Raspberry Pi platform and complement those by endpoints, e.g.,
using Android-based mobile devices. We design software systems for (mobile)
opportunistic communication using the SCAMPI router as one basis and
the Delay-tolerant Networking Research Group protocols for interoperable
data exchange.

Developing and prototyping applications for mobile opportunistic
communication. We worked with designers and carried out user studies
to understand which mobile opportunistic applications could be of
interest to the target group of students. The project created
application designs and implemented a prototype for the Android
mobile OS using infrastructure-assisted mobile-to-mobile networking.

This course will review architectural and protocol design
principles from theory as well as from practical experience over
the past decades. We will discuss building blocks and (design)
patterns for protocols and assess their applicability and their
limitations. We will validate how the various design principles
fit with and how they impact recent and foreseeable future
developments in communications and (inter)networking at large
and discuss how such principles may be to be restated or adapted
for new environments. While a clear focus is on architectures
and principles from the Internet and for internetworking we will
also consider lessons from other networking technologies.

This seminar addresses communications in environments with
unusual caracteristics, i.e. properties that traditional design
of communication protocols has not taken into account. Such
"challenged networks" may exhibit, e.g., long communication
delays, unpredictable link availability, and may not even
provide an end-to-end path at all. Sparse sensor networks,
interplanetary communications, and networks employing physical
information carriage belong to this category, but so does mobile
communication in the Internet. We will investigate novel
networking architectures dealing with such specific environments
and address issues of routing, reliability, security, and
application protocols and services. We will pay particular
attention to the DTN architecture developed in the DTNRG of the
Internet Research Task Force. Sources for the seminar will
primarily come from conferences and dedicated workshops on this
subject area. The course Delay-tolerant Networking (S-38.3151)
is not strictly a prerequisite, but provides the necessary
background.

Starting with a review of the basics of IP-based multimedia
communications, we will explore the details of real-time media
transport (RTP). Will will cover media descriptions, stream
configuration, and their distribution via annoucements (SAP,
SDP) and Internet Media Guides (IMG). One focus will be media
streaming int he Internet: interactively via the Real-Time
Streaming Protocol (RTSP), via various types of broadcast media
for IPTV services, and as peer-to-peer overlays. The other
focus will be the Session Initiation Protocol (SIP) as defined
in RFC 3261. We will discuss concepts, protocol details,
numerous extensions, and SIP's service creation architecture.
Specific application scenarios to be discussed include telephony
as well as instant messaging and personal presence. We will
also address security and NAT/firewalls traversal. Finally,
system design aspects (for endpoints as well as for
infrastructures) will be investigated. Lectures will be
complemented by two or three coding assignments.

This lecture addresses communications in environments with large
communication delay and/or high likelihood for disruptions.
Examples include sparse sensor and mobile ad-hoc networks,
networks with intermittent connectivity or disconnections,
deep-space and underwater communications, and communication in
environment without communication infrastructure such as remote
areas, developing regions, or disaster areas. Delays and link
availability in such "challenged networking environments" may be
unpredictable, storage, energy, or very constrained link
capacities may prevail, and and an "instant" end-to-end path
between peers may not be available at all. Communication may
also involve physical carriage of data (e.g., stored on a USB
stick or a hard drive) over short or long distances. We will
investigate novel networking architectures dealing with such
specific environments and address the specific challenges
arising from such environment for routing, reliability,
security, and application protocols and services. We will pay
particular attention to the DTN architecture developed in the
DTNRG of the Internet Research Task Force. The lecture will
include theoretical and practical (configuration and coding)
assignments.